I have a lot of experience at quitting smoking/chewing. First, you cannot successfully temporarily replace one with the other. In other words, if you use chew to quit smoking, you just end chewing full time, vice versa. It is all about the nicotine!
No matter what you use to quit, here is the key you must remember for the rest of your life. After you have stopped, You must NEVER chew or smoke again. That one little cig a year or two years down the road can cause a total collapse of all of your efforts. Nicotine is a very strong addiction that lasts forever. The addiction lasts forever...I can't say it enough.
Here is another tip...if you fail the first time, second, third, fourth, etc.....try try again!